Invention Grant
US07862666B2 Highly anticorrosive high strength stainless steel pipe for linepipe and method for manufacturing same 有权
用于线管的高防腐高强度不锈钢管及其制造方法

Highly anticorrosive high strength stainless steel pipe for linepipe and method for manufacturing same
Abstract:
A highly corrosion resistant high strength stainless steel pipe for linepipe, having a composition containing about 0.001 to about 0.015% C, about 0.01 to about 0.5% Si, about 0.1 to about 1.8% Mn, about 0.03% or less P, about 0.005% or less S, about 15 to about 18% Cr, about 0.5% or more and less than about 5.5% Ni, about 0.5 to about 3.5% Mo, about 0.02 to about 0.2% V, about 0.001 to about 0.015% N, and about 0.006% or less O, by mass, so as to satisfy (Cr+0.65 Ni +0.6Mo+0.55Cu−20C≧18.5), (Cr+Mo+0.3Si−43.5C−0.4Mn−Ni−0.3Cu−9 N≧11.5) and (C+N≦0.025). Preferably quenching and tempering treatment is applied to the pipe. The composition may further contain about 0.002 to about 0.05% Al, and may further contain one or more of Nb, Ti, Zr, B, and W, and/or Cu and Ca. The microstructure preferably contains martensite, ferrite, and residual γ.
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